Camera



Feb. 2, 1937. r J. H. TOBIN 2,069,339

CAMERA Filed Jan. 20, 1936 2 Sheets-Sheet 2 @WW h/E m sfifabm Patented Feb; 2, 1937 1 UNITED STATES Oman James H. Tobin, Fond du Lac, Wis aslignor to Tobin Tool and Die Company, Inc.-, Fond 'du Lac, Wis, a corporation of Wisconsin Application January 520, 1936. Serial No. 59,865 a '2 Claims. (eras-11') This invention relates to cameras and refers particularly to motion picture cameras of the type shown in Letters Patent No. 2,019,767 issued to Charles E. Philmore, November th, 1935,-

5 In cameras of this type. difficulty has been experienced in guarding the film'against light until its actual exposure. It is, therefore, an object of the present invention to provide means for concentrating the light entering the camera through its objective so as 'to preclude the possibility of light striking the'film before actual exposure. v

It is also an object of this invention to provide a light concentrator for the purpose stated which will not in anywise alter the design or construction of the camera.

With the above and other objects in view whichwill appear as the description proceeds, this invention resides in the novel construction, combination and arangement of parts substantially as hereinafter described and more particularly defined by the appended claims, it being under stood that such changes in the precise embodiment of the hereindisclosed invention may be made as come within the scope of the claims.

- The accompanying drawings illustrate one complete example of the physical embodiment of the invention constructed according to the best mode so far devised for the practical application of the principles'thereol', and in which:

Figure 1 is a sideview of a camera embodying this invention with parts thereof broken away to show structural details;

Figure2 is an enlargedv side view of a portion of a camera; v

Figure 3 is a front view of part of the camera with a portion thereof broken away and insection; t

centrator per se; and

Figure 5 is a perspective view of the film guideway or track. 2 I f l t Refen'ing'no'w more particularly to the accom- 1 panying, drawings in which like numerals indicate like parts throughout the several views, the

numeral 5 designates the-housing of'a camera constructed in accordance with this invention.

, The mechanism of the cameracontained within The front 'wall 8 of thiscompartment carries the 5 objective orlens 9 in a focusing mounting l0:

particularly bad through the slots II! which ac- The back of the shutter compartment is closed by a film guideway ortrack ll held in place by screws l2.

This film guideway or track is a stamped sheet metal unit and has a channel l3 to receive and 5 guide the film F past an aperture II in the bottom of the channel l3 and in line with the objective 9. The mechanism \for advancing the film along the channel It includes a sprocket wheel l5 and a claw l6 which reaches into the shutter 10 compartment and has tines l'l projecting rearwardly through slots IS in the bottom wall of the channel l3 to engage the film. The film is properly held in the channel It by a pressure V The usual shutter 20 is rotatably mounted within the compartment. I to intermittently expose the film as it is advanced through the camera.

It is to be observed that the shutter compartment has substantial area and that while the film 20 guideway or track protects the film from exposure to light entering the compartment through the objective except at the aperture I4 ,and at the dictation of te shutter 20, nevertheless, it was impossible with past constructions to completely 25 shield the film against premature exposure, and

as a consequence the pictures taken did not have the desired degree of' clarity. Light leakage was commoclate the tines of the claw l6. s

'I'he present invention overcomes these disadvantages by concentrating the light directly after it enters the, shutter compartment through the objective, andfor this purpose, a light concentrator,'indicated generally by the numeral 2|, is 35 provided. This concentrator comprises .a tube or sleeve 22 mounted on a bracket 23 fastened r p in the shutter compartment by screws 2,4. Figure 4 is a perspective view of the light con- Thebracket 23 is of such dimensions as to locate the cylinder or sleeve 22 co-axially with 4 the objective with its front endat which it is fastened to the bracket adjacent the shutter 20 and its rear end engaging ordirectly adjacent the film guideway or track.- The light entering the objective is thus concentrated onto thevporticn 45 of the film in line withithe aperture; l4 and prevented from. striking the film. before its actual exposure.

It'is alsoto be noted that the bracket 28 overlies the film guideway or track thus further preventing light from reaching the film.

To break up the light and prevent reflection the interior of the cylinder or sleeve 22 has a plurality of annular serrations 2i, and the entire concentrator structure is dull black.

From the foregoing description taken in connection with the accompanying drawings, it will be readily apparent to those skilled in the motion picture art to which this invention appertains, that this invention provides simple and eflicient means for use in a camera'to prevent the access of light rays to the fllm prior' to the actual exposure thereof. I

What I claim as my invention: 1, In a camera, ahousing having a bottom wall and side walls and having a protrusion on one 01 its side walls defining a shutter compartment, said shutter compartment having a solid front wall'and end and bottom walls integral therewith comprising a tube and a bracket to which the tube is secured, said bracket having an attaching flange adapted to be screwed to the side wall or the shutter compartment in a position locating the tube co-axially with the aperture and the objective and with the securing means therefor and the aperture.

readily accessible through the open side 'of the shutter compartment, and a readily removable cover to close said open side of the shutter compartment.

2. In a camera, a housing for the mechanism I having a front wall provided with a protrusion forming a shutter compartment,said compartment being substantially oblong in shape and disposed wholly in front of the housing per se and having solid front, end and one side wall with the other side open, a removable cover to close said open side of the compartment, an apertured plate providing a back wall for the coinpartment and adapted to guide film past the aperture therein, an objective on the exterior or the front wall in line with the aperture, and a light concentrator between the ,front wall and:

the apertured plate comprising a tube and a bracket to which the tube is secured, thebracket having an attaching flange-to lie flat againstthe solid side wall of the compartment, and screw means readily accessible through the open side of the compartment for securing said flange to the side wall to mount the" light concentrator with its tube in co-axial alignment with the objective JAMES H. 'ronm. 

